| From: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: compiler warnings on the buildfarm |
| Date: | 2007-07-12 21:22:14 |
| Message-ID: | 46969B86.4040908@kaltenbrunner.cc |
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| Lists: | pgsql-hackers |
Alvaro Herrera wrote:
> Stefan showed me via Jabber this warning:
>
> /tmp/ccM7MfqX.s: Assembler messages:
> /tmp/ccM7MfqX.s:703: Warning: 00000003fffffffc shortened to 00000000fffffffc
> /tmp/ccM7MfqX.s:738: Warning: 00000003fffffffc shortened to 00000000fffffffc
>
> He says that this comes from trgm_op.c file. I don't get the warning
> myself obviously, so I started guessing.
>
> 3FFFFFFFC = 1111111111111111111111111111111100
> FFFFFFFC = 11111111111111111111111111111100
>
> So the upper 2 bits are being lost (the second number is 32 bits wide).
>
> The only thing that I think is related is the usage of VARSIZE(). It
> looks like 0x3FFFFFFF (actual constant in the toast code) is shift two
> bits left. I can see no such operation though.
this one is from
http://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=caracara&dt=2007-07-12%20200001&stg=make-contrib
as I'm going through the warnings in contrib now.
Stefan
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